SuiteCRM - Open source CRM for the world

Zammad is a web based open source helpdesk/customer support system.

An open source issue management & help desk solution. A zendesk & jira alternative

Free and Open Source Enterprise Resource Planning (ERP)

Huly — All-in-One Project Management Platform (alternative to Linear, Jira, Slack, Notion, Motion)

A Powerful Laravel Help Desk and Lead Management App

🔥🔥🔥 Open-source Jira, Linear, Monday, and ClickUp alternative. Plane is a modern project management platform to manage tasks, sprints, docs, and triage.